A .. can be sturdy.Logical formLearned from12 sentences. Casters can be sturdy.Logical formLearned from12 sentences. Zippers can be sturdy.Logical formLearned from12 sentences. (Metal legs) can be sturdy.Logical formLearned from12 sentences. A desk can be sturdy.Logical formLearned from12 sentences. A set can be sturdy.Logical formLearned from12 sentences. Wings can be sturdy.Logical formLearned from12 sentences. A (metal construction) can be sturdy.Logical formLearned from12 sentences. A workhorse can be sturdy.Logical formLearned from12 sentences. An effort can be sturdy.Logical formLearned from12 sentences. Innings can be sturdy.Logical formLearned from12 sentences. A house can be sturdy.Logical formLearned from12 sentences. Columns can be sturdy.Logical formLearned from12 sentences. A floor can be sturdy.Logical formLearned from12 sentences. Opposition can be sturdy.Logical formLearned from12 sentences.